Hi XXXXXX,
Some dogs respond to simple rest, anti-inflammatory agents and muscle relaxants.
I don't know how bad his progression is, and in what physical state he is in currently so it's hard to say. - See how things go in the short-mid term, and if he gets worst, then make a decision at that time.
I'm sure financing is available where you are and probably even at the vet's office, if immediate full payment is not an option.
Here's a link with more information on this:
http://www.gopetsamerica.com/dog-health/intervertebral-disk-disease.aspx
Hope this helps!
Patrick
Had various dogs for over 10 years
Multiple Dog Owner and Lover! :)